The following are the specifications for all the YES WorldWatch V7 watches:

• Preprogrammed for 650 cities worldwide through year 2099.
• Location can also be set by LAT/LON and it has 10 cities always kept in memory.
• Digital time, LCD display and hand automatically adjusts for Daylight Saving Time and Time Zone.
• DST can also be manually turned ON and OFF.
• Times for sunrise, zenith, sunset, twilight (all 3 levels) and true midnight.
• Sunrise and sunset alarm with 0-99 minutes pre-alarm.
• Equinox, solstice and cross quarter day alerts with event times.
• Times for moonrise, moonset, moon phase, % illumination plus exact time and date for the next new and full moons.
• LCD ARC day/night display with twilight.
• HRS:MIN:SEC in AM/PM or 2400 format.
• Month, date, day, year and DOY.
• Regular set alarm with 10 minute snooze, 99 minute timer, top of the hour alarm with user choice of active range and 999 day countdown/up.
• 24 hour stop with with lap time and memory measured in 1/100 of a second.
• Electronic compass with NSEW direction and degree readout.
• 7 languages: English, Spanish, German, French, Norwegian, Italian and Portuguese.
• Rechargeable battery via wireless charging bed. Up to 3 months of operation on a full night of charging with battery life estimated at 5 years plus. The battery can be replaced. To learn more about how to treat lithium batteries, see this link: How to Prolong Lithium-based Batteries.
• Crisp night time viewing provided by LUME on daytime hour markers, 13+1 tritium tubes on nighttime hour markers+hand and electro luminescent back light.
• Unique software time trim allows for adjusting the watch  to a +/-0.5 second monthly accuracy.
• Ronda Swiss Made servo driven 24-hour analog hand.
• 46x16mm case, 22 mm lug nut width, adjustable locking clasp on titanium bracelets.
• Titanium case construction with scratch proof sapphire crystal to 10 ATM water resistance.
• Your choice of bezel design, color, finish, bracelet and soft straps.
• Comes in a sturdy box made for worldwide shipping. Instruction Manual and jewelers tools included.
• Two Year Warranty.

Across the planet there are upwards of 20 different Daylight Saving Time systems. The WorldWatch incorporates all of them in the programming for the relevant cities and automatically adjusts for them. If need be, DST can also be turned ON and OFF manually.